Impossible to reset to its default the velocity of a note

Issue type

UX/Interaction bug (incorrect behaviour)

Description with steps to reproduce

1. Enter a few note and a "p" dynamic on the first note
2. Select one of the notes and open its "Playback" panel . The velocity is indicated as "64".
3. Change to velocity to "15" and play the phrase. That note can be now heard as lower that the other notes of the phrases
4. Reset that note velocity in order to have it controlled by the last dynamic (the "p") , by either (a) typing "64" as velocity, or (b) using the reset button above the velocity.

Expected:
When playing the phrase, that note has the same velocity as the other ones of the phrase,

Actual:
The note has a much louder velocity.

Conclusion:

1. The original default velocity "64" is incorrect and does not reflect the actual velocity of the note but instead and "unspecified" velocity
2. Resetting or typing a velocity does not return to that "unspecified" state but to an actual velocity of "64".
   Its velocity can no longer be controlled by dynamics.

Workaround:

1. Delete the note and retype it. Its velocity will be reset to "unspecified"

This is a regression of MU3 where a single note velocity could be defined either as absolute or as offset. Resetting a note velocity with simple a matter of setting it to "Offset | 0".

Supporting files, videos and screenshots

What is the latest version of MuseScore Studio where this issue is present?

MU4.5.2

Regression

Yes, this used to work in MuseScore 3.x and now is broken

Operating system

Windows 10

Additional context

No response

Checklist

• This report follows the guidelines for reporting bugs and issues
• I have verified that this issue has not been logged before, by searching the issue tracker for similar issues
• I have attached all requested files and information to this report
• I have attempted to identify the root problem as concisely as possible, and have used minimal reproducible examples where possible